Built by 3D printer manufacturer Hyrel 3D, the Emulsifiable Extruder (EMO1) can print with Play-Doh, clay, plasticine, and silicone, with more materials on the way. This printer actually started out as a an April Fools joke on ultra-nerdy site ThinkGeek, but Hyrel 3D took on the challenge of building a 3D printer that could print with more than just ABS or PLA plastics.